[091/nnn] poly_int: emit_single_push_insn_1

[Richard Sandiford]

This patch makes emit_single_push_insn_1 cope with polynomial mode sizes.


2017-10-23  Richard Sandiford  <richard.sandif...@linaro.org>
            Alan Hayward  <alan.hayw...@arm.com>
            David Sherwood  <david.sherw...@arm.com>

gcc/
        * expr.c (emit_single_push_insn_1): Treat mode sizes as polynomial.
        Use plus_constant instead of gen_rtx_PLUS.

Index: gcc/expr.c
===================================================================
--- gcc/expr.c  2017-10-23 17:25:35.142976454 +0100
+++ gcc/expr.c  2017-10-23 17:25:37.064907370 +0100
@@ -4141,9 +4141,6 @@ emit_single_push_insn_1 (machine_mode mo
      access to type.  */
   else if (targetm.calls.function_arg_padding (mode, type) == PAD_DOWNWARD)
     {
-      unsigned padding_size = rounded_size - GET_MODE_SIZE (mode);
-      HOST_WIDE_INT offset;
-
       emit_move_insn (stack_pointer_rtx,
                      expand_binop (Pmode,
                                    STACK_GROWS_DOWNWARD ? sub_optab
@@ -4152,31 +4149,27 @@ emit_single_push_insn_1 (machine_mode mo
                                    gen_int_mode (rounded_size, Pmode),
                                    NULL_RTX, 0, OPTAB_LIB_WIDEN));
 
-      offset = (HOST_WIDE_INT) padding_size;
+      poly_int64 offset = rounded_size - GET_MODE_SIZE (mode);
       if (STACK_GROWS_DOWNWARD && STACK_PUSH_CODE == POST_DEC)
        /* We have already decremented the stack pointer, so get the
           previous value.  */
-       offset += (HOST_WIDE_INT) rounded_size;
+       offset += rounded_size;
 
       if (!STACK_GROWS_DOWNWARD && STACK_PUSH_CODE == POST_INC)
        /* We have already incremented the stack pointer, so get the
           previous value.  */
-       offset -= (HOST_WIDE_INT) rounded_size;
+       offset -= rounded_size;
 
-      dest_addr = gen_rtx_PLUS (Pmode, stack_pointer_rtx,
-                               gen_int_mode (offset, Pmode));
+      dest_addr = plus_constant (Pmode, stack_pointer_rtx, offset);
     }
   else
     {
       if (STACK_GROWS_DOWNWARD)
        /* ??? This seems wrong if STACK_PUSH_CODE == POST_DEC.  */
-       dest_addr = gen_rtx_PLUS (Pmode, stack_pointer_rtx,
-                                 gen_int_mode (-(HOST_WIDE_INT) rounded_size,
-                                               Pmode));
+       dest_addr = plus_constant (Pmode, stack_pointer_rtx, -rounded_size);
       else
        /* ??? This seems wrong if STACK_PUSH_CODE == POST_INC.  */
-       dest_addr = gen_rtx_PLUS (Pmode, stack_pointer_rtx,
-                                 gen_int_mode (rounded_size, Pmode));
+       dest_addr = plus_constant (Pmode, stack_pointer_rtx, rounded_size);
 
       dest_addr = gen_rtx_PRE_MODIFY (Pmode, stack_pointer_rtx, dest_addr);
     }